The temperature and magnetic field dependences of the critical current density in silicone oil doped MgB2 polycrystalline samples have been investigated by magnetic measurements. The upper critical magnetic field anisotropy, γ=H_c2^(⟘c)/H_c2^(...
c), dependence of the critical current density, Jc(B), were analyzed within the percolation model . The calculated critical current densities based on percolation theory are in agreement with the experimental data. It was found that the anisotropy, γ, and the percolation threshold parameter, pc, show different trends in their temperature dependenc...

Magnetic and transport properties of 10 wt% SiC doped MgB2 and 5 wt% nano-C doped MgB2 were studied by resistance and critical current density measurements. The results showed improvement of the critical current density for the MgB2 superconductor...

The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function ofmagnetic field and temperature. A crossover field, Bsb, was observed...

critical field, the irreversibility field, and the Jc(B) compared to the wet

succinic acid doped MgB2 and the pure MgB2. The field dependence of Jc(B) was analyzed within the

collective pinning model. The observed temperature dependence...